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HomeMy WebLinkAbout20181046 Airosmith Correspondance (2) 21712019 Z mbra Zimbra jennifer.merriman@saratoga-springs.org RE: Porous Pavement Section --------- From : David J Gasper (DEC) <david.gasper©deci ..o eb 07, 2019 12:32 PM Subject : RE: Porous Pavement Section al attachment To : Douglas Heller <dheller@thelagroupicom>,11 F-Ei 0 20/9 Doug, We tell designers that the design/performance criteria in the Design Manual is generally considered guidance. (Note: this does not include the required sizing criteria - RIRv, W0v Cpv, Op and Of)Therefore, the design engineer can always propose an alternative design provided they include a demonstration of equivalence in the SWPPP. For your choker course thickness scenario,you can research other states standards (see New Jersey and Minnesota) and use their design criteria as an acceptable alternative. Let me know if this answers your question. From: Douglas Heller <dheller@thelagroup.com> Sent: Wednesday, February 06, 2019 1:45 PM To: Gasper, David J (DEC) <david.gasper@dec.ny.gov> Subject: Porous Pavement Section ATTENTION: This 6-311)C frOM t2A-ierfoi scqirce. Do nol open attachments or click on links from unknown senders 0/:unexpected Aw,s, Dave, Question on porous pavement section. The NYSDEC Manual states using a 4-8" deep choker course of No. 57 stone. Per our experience with installation of porous pavement the choker course helps provide a better paving surface by chinking in the top layer of reservoir stone. It's our understanding that the thickness of the choker course does not provide any stormwater quality benefits. We have had success on numerous projects placing only an r of choker course, which follows other states (Minnesota) and agencies (FHWA) recommendations for a porous pavement section. We have actually seen issues with the choker course pushing/rutting during installation with a thicker course. In meeting the NYSDEC stormwater requirement is using a 1" thick choker course in the porous pavement section an acceptable alternative to the 4-8" depth stated in the NYSDEC Manual? Thanks. Douglas Heller, P.E. Associate Principal Civil Engineer The LA GROUP Landscape Architecture and Engineering.P.C. People. Purpose. Place. 40 Long Alley Saratoga Springs.NY 12866 P:518/587-8100.x231 F: 518/587-0180 dhellerigthelagroup.corn https://m.saratoga-springs.org)hipr ntmessage?ic1=782948,part=28,tz=AniericaiNew_York 1/2 2/7/2019 Zimbra Cheek out new website Intps: protect2.fireeve,corn urrk-318 6 Ve-6c1b9c Sfe-31839609-000babd9175c-ld0a011e77u9tBStu—httpiN io,,Ilviagroup,conv Twitter I Facebook Linkedin , Total Control Panel Lin To: Remove this sender from my allow list dhelier©thelagroup.corn From: davidigasper@dec.ny.gov You received this message because the sender is on your allow list. Unknown <textifhtml> 10 KB ,• https://m.saratoga-springs.orgihiprintmessage?Id-=782948,part=28az=AmericaiNew_York 2/2